Intake vent for MUA placement
I have a 1,200 CFM canopy hood on the way. It will be installed on the inside of an exterior wall and vented straight up thru the roof, no turns. My contractor is suggesting I install an "intake vent with a damper on it directly behind the range, close to the floor, to provide makeup air. While I'm not 100% opposed to this, I don't think it is really needed. It is an older house with plenty of "holes" in it. The house also has a 1,500+ CFM whole house fan which we have used on High for years and have never had any carbon monoxide, backdraft, negative pressure, etc... type problems.
But, if I really should install the vent, is the proposed location a good one? Do I need to worry about cold/hot air seeping in during Winter/Summer months?
Is it just better to crack a window when needed?